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Doctor insights on: What Are Allegra And Xyzal Used For

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What are allegra and xyzal (levocetirizine) used for?

What are allegra and xyzal (levocetirizine) used for?

Allergies: Allegra and xyzal are two different types of antihistamines. They are called non sedating antihistamines as older antihistamines like Benadryl (diphenhydramine) cause drowsiness in some people. The entire class of medicines are used to treat allergies or allergic reactions. ...Read more

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Xyzal (Definition)

Levocetirizine is an antihistamine that is used to treat the symptoms of hay fever and allergies like runny nose, stuffy ...Read more


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I'm transitioning from xyzal (levocetirizine) to allegra & my hives are returning. I seem to react to everything--my meds & enviorment. When will allegra kick in?

I'm transitioning from xyzal (levocetirizine) to allegra & my hives are returning. I seem to react to everything--my meds & enviorment. When will allegra kick in?

Reason?: We don't usually switch pills when you are doing well with it. Xyzal (levocetirizine) does have a slightly higher incidence of drowsiness compared to allegra. One would expect Allegra to take effect in about 2 hrs. If the reason for switch is due to drowsiness, then you may up the dose of Allegra to 2 to 4 x daily . If xyzal (levocetirizine) did not have side effects, then there is no reason to change to allegra. ...Read more

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I was prescribed xyzal (levocetirizine) for my allergies. I took an allegra this morning. Should I start the xyzal (levocetirizine) tonight or wait until tomorrow?

I was prescribed xyzal (levocetirizine) for my allergies. I took an allegra this morning. Should I start the xyzal (levocetirizine) tonight or wait until tomorrow?

Ok: It would generally be ok to take Xyzal (levocetirizine) in the evening after taking an am Allegra, especially if there is a predominance of nighttime symptoms. Good luck! ...Read more

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What antihistamines give me 24hr protection? Allegra 180mg? Can I take Xyzal (levocetirizine) 5mg at night and Allegra 180mg morning? Topping up prove effective?

What antihistamines give me 24hr protection? Allegra 180mg? Can I take Xyzal (levocetirizine) 5mg at night and Allegra 180mg morning? Topping up prove effective?

Yes: Depends on the condition. Most of the newer antihistamine may cover hay fever symptoms for nearly 24 hrs but would not be sufficient to control hives. Antihistamines have a high safety margin on dosing and thus it is ok for you to use both if necessary. ...Read more

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I'm on allegra 180mg in the morning, xyzal (levocetirizine) 5mg at night, plus dymista and immun shots, and i still get a lot of white mucus when I do a sinus rinse why?

I'm on allegra 180mg in the morning, xyzal (levocetirizine) 5mg at night, plus dymista and immun shots, and i still get a lot of white mucus when I do a sinus rinse why?

Some mucus is normal: Your therapies are to control symptoms, but your upper respiratory mucosa is still functional. If sneezing, congestion, runny nose, etc are controlled then i would not be overly concerned with the nasal wash results. ...Read more

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Is it OK to take 180 mg Allegra in AM and 10m Zyrtec AND Xyzal (levocetirizine) at dinner? Allergist said to take TWO Allegra, but I'm worried it's too much

Is it OK to take 180 mg Allegra in AM and 10m  Zyrtec AND Xyzal (levocetirizine) at dinner? Allergist said to take TWO Allegra, but I'm worried it's too much

Mixing antihistamine: Generally, it's best to follow one's doctor's instructions. If not wanting to take Allegra twice a day, and wanting to add a different antihistamine such as Zyrtec or Xyzal (levocetirizine), (levocetirizine) it is probably enough to take Zyrtec or Xyzal (levocetirizine) (one of them instead of both of them). Zyrtec and Xyzal (levocetirizine) are very similar. The makers of Xyzal (levocetirizine) say it is more effective than Zyrtec, but they are similar drugs. ...Read more

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If allergic to 1 antihistamine, am i allergc to all? Have seen a few hives after benadryl, (diphenhydramine) xyzal, & now allegra. Coincidence or true allergy?

If allergic to 1 antihistamine, am i allergc to all? Have seen a few hives after benadryl, (diphenhydramine) xyzal, & now allegra. Coincidence or true allergy?

PROBABLY COINCIDENT: It is not possible to be allergic to all antihistamines and these are all different componds you listed.Benadryl, (diphenhydramine) xyzal and allegra.I will like to know what you call allergy, what are the symptoms and what kind of rash if any with these three antihistamine. It is possible but this kind of allergy will be considered rare consult your doctor who treated your allergies in first place;may beallergist. ...Read more

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Dr. Eric Weisman
94 doctors shared insights

Levocetirizine (Definition)

Levocetirizine is an antihistamine that is used to treat the symptoms of hay fever and allergies like runny nose, stuffy ...Read more


Dr. Krishna Kumar
334 doctors shared insights

Fexofenadine (Definition)

Fexofenadine, previously marketed under the brand name allegra, is an antihistamine similar to ...Read more